Inclusive $\Sigma^-$ and $\Lambda(1520)$ production in hadronic Z decays

Production of Sigma- and Lambda(1520) in hadronic Z decays has been measured using the DELPHIdetector at LEP. The Sigma- is directly reconstructed as a charged track in the DELPHImicrovertex detector and is identified by its Sigma-> n pi decay leading to a kink between the Sigma- and pi-track. The reconstruction of the Lambda(1520) resonance relies strongly on the particle identificationcapabilities of the barrel Ring Imaging Cherenkov detectorand on the ionisation loss measurement of the TPC. Inclusive production spectra are measured for both particles. The production rates are measured to be = 0.081 +/- 0.002 +/- 0.010, = 0.029 +/- 0.005 +/- 0.005. The production rate of the Lambda(1520) suggests that a large fraction of the stable baryonsdescend from orbitally excited baryonicstates. It is shown that the baryonproduction rates in Z decays follow a universal phenomenological law related to isospin, strangeness and mass of the particles.